I'm very interested how your vets proceed with horses which are not 
really lame but a little unclear (slightly off?) on endurance events. 
Do the vets warn the riders ? Do you have check/ rider cards where 
the vets fill in their diagnosis ?
In Germany, the horse must almost be fit to go 20 km (15 mls) further 
without pain or damage, or will be eliminated. for practical use, the 
vets distinguish between 4-5 lameness grades. We make no big 
differences between pre ride, ride and post ride evaluation. 
L1 is allowed to start or go further, but "conditional", slowly. If 
the lameness become worse, the rider is out.
L2 is mostly out.
Once I read that at some rides (in the USA?) the vets mark the legs 
of critical horses with BRIGHT COLOUR to help their colleagues and 
warn the rider. My oppinion: No bad idea, because the so 
"brand-marked" rider will ride more carefully! Does anyone knows such 
a rough practice ? Or do you have more sophisticated solutions (as we 
have, with our check-cards) ?
Or do you let them go further anywhere ? Sometimes, when I read the 
result lists of the US-rides, I'm astonished about the fact you ride 
only excellent horses. But is this true ? Only an example: 50 mls: 45 
starters, 42 finishers. In germany, we would have 30 finishers - at 
the most ! (I'm not shure, maybe we/ our vets are too carefully??) 
I read in an article of DVM Mackay-Smith in some US-rides the 
post-ride-evaluation criteria is "sound at walk" instead of the older 
"fit to continue/ sound at trot". Is that true ? If yes, is it a good 
solution ? What is your oppinion ?
I will be thankfull also for private email answers. Please mention if 
you are an experienced rider, official person or ride manager, 
because I don't know you exactly in the states.
regards FRANK